I have an RM DTM exhaust. Didn't have a problem when I got my last check. On my other cars, never had a problem either even with different brands of catback or axel back exhausts. The guys doing the checks always seemed more concerned with mods in the engine bay, things like headers, intakes, etc. Just make sure you get stuff that's CARB certified. They should have a list of aftermarket items that have passed certification. (Assuming they update the list. I went to one place that had a list from 1995 and wouldn't pass my 97 Integra with an AEM CAI.) Some experienced smog techs will even know what manufacturers and parts have certification and don't even bother checking the list and just pass you visually anyways. (The second tech I took my Integra knew all about AEM CAIs and just said "Bah, I know those are certified already. I don't need to check my list," and proceeded on with the emission testing.
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1995 NSX-T
1999 3.2TL
2001 Odyssey
1992 SC400
[This message has been edited by FuryNSX (edited 12 April 2002).]